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drivers base/cacheinfo: Convert to hotplug state machine 

Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs. No functional change.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20161103145021.28528-13-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-11-03 15:50:08 +01:00 committed by Thomas Gleixner
parent dfbbd86a0f
commit 7cc277b489
1 changed files with 15 additions and 42 deletions
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57
drivers/base/cacheinfo.c
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@ -498,57 +498,30 @@ static int cache_add_dev(unsigned int cpu)
return rc;
}
static void cache_remove_dev(unsigned int cpu)
static int cacheinfo_cpu_online(unsigned int cpu)
{
if (!cpumask_test_cpu(cpu, &cache_dev_map))
return;
cpumask_clear_cpu(cpu, &cache_dev_map);
int rc = detect_cache_attributes(cpu);
cpu_cache_sysfs_exit(cpu);
if (rc)
return rc;
rc = cache_add_dev(cpu);
if (rc)
free_cache_attributes(cpu);
return rc;
}
static int cacheinfo_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
static int cacheinfo_cpu_pre_down(unsigned int cpu)
{
unsigned int cpu = (unsigned long)hcpu;
int rc = 0;
if (cpumask_test_and_clear_cpu(cpu, &cache_dev_map))
cpu_cache_sysfs_exit(cpu);
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_ONLINE:
rc = detect_cache_attributes(cpu);
if (!rc)
rc = cache_add_dev(cpu);
break;
case CPU_DEAD:
cache_remove_dev(cpu);
free_cache_attributes(cpu);
break;
}
return notifier_from_errno(rc);
free_cache_attributes(cpu);
return 0;
}
static int __init cacheinfo_sysfs_init(void)
{
int cpu, rc = 0;
cpu_notifier_register_begin();
for_each_online_cpu(cpu) {
rc = detect_cache_attributes(cpu);
if (rc)
goto out;
rc = cache_add_dev(cpu);
if (rc) {
free_cache_attributes(cpu);
pr_err("error populating cacheinfo..cpu%d\n", cpu);
goto out;
}
}
__hotcpu_notifier(cacheinfo_cpu_callback, 0);
out:
cpu_notifier_register_done();
return rc;
return cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "base/cacheinfo:online",
cacheinfo_cpu_online, cacheinfo_cpu_pre_down);
}
device_initcall(cacheinfo_sysfs_init);